Plant Growth

Question 1

Development is the sum of two processes:

Answer 1

growth and differentiation

Question 2

What plants have lateral meristems?

Answer 2

Dicotyledons and gymnosperms

Question 3

What is growth at cellular level?

Answer 3

Increase in amount of protoplasm

Question 4

Growth rate of single maize cell root apical cell?

Answer 4

17,500 new cells per hour

Question 5

Watermelon cells increase in size up to?

Answer 5

3.5 lakh

Question 6

What are the characteristics of root of elongation

Answer 6

Increased vacuolation, cell enlargement and new cell wall deposition

Question 7

What is r

Answer 7

efficiency index

Question 8

How do tracheary elements form

Answer 8

Lose protoplasm, secondary lignocellulosic cells

Question 9

Cells positioned away from root apical meristems differentiate as ________, while those pushed to the
periphery mature as ___________

Answer 9

root cap cells, epidermis

Question 10

Name two adenine derivatives

Answer 10

N6-furfurylamino purine, kinetin

Question 11

Name a carotenoid hormone

Answer 11

ABA

Question 12

What kind of hormone is GA

Answer 12

Terpelene

Question 13

Ethylene is largely an _________

Answer 13

inhibitor

Question 14

Auxin was isolated by? From?

Answer 14

F.W Went, coleoptile of oat seedlings

Question 15

F. Skoog and his co-workers observed that from the internodal segments of tobacco stems the callus (a mass of undifferentiated cells) proliferated only if, in addition to auxins the nutrients medium was supplemented with one of the following:

Answer 15

extracts of vascular tissues, yeast extract, coconut milk or DNA.

Question 16

Who discovered kinetin

Answer 16

Miller

Question 17

Who discovered ethylene

Answer 17

Cousins

Question 18

Spraying sugarcane with GA increases yield by?

Answer 18

20 tonnes per acre

Question 19

What is respiratory climactic?

Answer 19

Ethylene is highly effective in fruit ripening. It enhances the respiration rate during ripening of the fruits. This rise in rate of respiration is called respiratory climactic.

Question 20

NAme three chemical inhibitors

Answer 20

abscissic acids, phenolic acids, para-ascorbic acid

Question 21

. Effect of inhibitory substances can be removed by subjecting the
seeds to chilling conditions or by application of certain chemicals like

Answer 21

GA and nitrates

Question 22

Natural auxins and synthetic auxins?

Answer 22

IAA and IBA

NAA 2,4-D

Question 23

Auxins kill _____________ weeds

Answer 23

dicotyledons

Question 23

Auxins kill _____________ weeds

Answer 23

dicotyledons

Question 24

_______________ with GAs hastens the maturity period, thus leading to early seed production

Answer 24

Spraying juvenile conifers

Question 25

__________ also promotes
root growth and root hair formation, thus helping the plants to increase
their absorption surface.

Answer 25

Ethylene

Question 26

____________ is used to initiate flowering and for synchronising fruit-set in pineapples.
_________ promote flowering e.g. in pineapples.

Answer 26

Ethylene

Auxins

Question 27

Plants with two varieties?

Answer 27

wheat, barley, rye

Question 28

Name the biennials

Answer 28

Sugarbeet, cabbages, carrots